The formation of Schrodinger cat-like states in the process of spontaneous parametric down-conversion

The formation of Schrodinger cat-like states during the spontaneous parametric down-conversion process (SPDC) is studied when the pump mode is considered quantum and depleted. The Schrodinger cat-like state is formed in the fundamental and second harmonic modes, and the negativity in both modes is studied for certain initial state conditions and interaction lengths. The Wigner function is used to visualize qualitatively Schrodinger cat-like states.
https://arxiv.org/abs/2405.14526